Concrete Slab Calculator

How to use it

1. Calculate area: 6m × 4m = 24m²
2. Calculate volume: 24m² × 0.20m = 4.8m³ of concrete
3. Calculate cement: 4.8m³ × 7 = 33.6 → 34 bags
4. Calculate steel: 24m² × 12 kg/m² = 288 kg
5. Plan formwork for slab edges and openings

Common mistakes

• ⚠️ Using insufficient slab thickness leading to excessive deflection
• ⚠️ Not placing distribution steel perpendicular to main reinforcement
• ⚠️ Omitting bar chairs to maintain correct concrete cover

Worked example

Calculate materials for a concrete slab 6m x 4m with 0.20m thickness and 12 kg/m² steel.

For {area_m2} m² of slab: {vol_m3} m³ of concrete, {cement_sacos} bags of cement and {acero_kg} kg of steel reinforcement.

Input guide